Method of making pencil bodies and the like



J. P. LYNN METHOD OF MAKING PENCIL BODIES AND THE LIKE Aug. 2 1927. v1,638,002

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2 Shets-Sheet 2 METHOD 0F MAKING PENCIL BODIES AND THE LIKE Aug. 2 1927.

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Patented ug. 2, 1927.

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JOHN P. LYNN, OF OHICAGO, ILLINOIS.

METHOD OF MAKING PENCIL BODIES AN D THE LIKE.

Application filed August 4, 1926. Serial No. 126,977.

This invention relates tov a process of forming pencil bodies from a material which maybe rendered plastic under the application of a proper heat. It may be` employed with advantage in the manufacw manufacture of .pencil bodies from' a` fusiblek ture of a pencil body having the characteristics which are vset forth in my co-pending application Serial No. 126,976, tiled August i, i926. y

ln the manufacture of pencil bodies rom fusible materials, as heretofore practiced, it has beenvcustomarv to use such materials in powder or granular form. It has also'been the practice to make the pencil body in halves, usually in the form of biscuits, and then by a second operation unite thesey halves or biscuits to form complete bodies. The manufacture of pencil bodies by/any such process is atnded with certain difficulties, such as the use of the `correct amount et material for each moulding operation, the elimination of a parting line when the pencil halves are united, etc; Also, the

die moulds for the production of pencils a'c-` cording to such processes has involved considerable expense, thus adding to the difficulties in the way of their use. f

According to the present invention I am enabled to .proceed expeditiously with the shown in the accompanying drawings, in

the manner following:

Figure 1 is a top plan View of a frame containing die moulds whereinare formed certain products in accordance `with my invention; f

Fig. 2 is a vertical section through the moulds before the l application of pressure thereto; c

Fig. 3 is a similar view showing the moulds under compression; f

Figs. 4 and 5 are transverse sections taken exact amount of i in contemplated,

respectively on lines 1 -4i and 5-5 of Figs. 2 and 8;

Fig. 6, which is an enlarged detail in transverse section, shows a tubular sleeve arranged over an elliptical mandrel, as these parts appear previous to pressure from the dies;

Fig. Z is an enlarged sectional view through the moulds, taken on line 7-7 of Fig. 3;

Fig. 8 is a longitudinal section through the product which is formed from the dies herein illustrated;

Fig. 9, which is a longitudinal section through the die moulds prior to compression, shows therein the fusible material whereof one part is tubular in form;

Fig. 10 is a transverse section therethrough on line 10--10 of Fig. 9;

Fig. 11, which is a view similar to Fig. 10, shows the dies as compressed during the moulding operation; and

Fig. 12 is a longitudinal section through a pair of moulds` designed for the production o another form of article, such, for example, as the barrel of' 'a fountain pen.

In carrying Vout the present process, I employ a boxlike frame A having vertical end walls 15 and a removable side 16, which is adapted to be held in closed position by any suitable means. Within this frame is accommodated a pair of die moulds B and C adaptedcto be compressed between platens D, with' one of which may be associated a suitable `cylinder mechanism E.. Between the ends of the moulds and the frame walls 15 are blocks 17 adapted to support mandrels dBi/and 19. 'As shown, the two mandrels extend toward each other in mutual alignment,

voneo them being reduced to an elliptical contour for a substantial portion of its length, as at 20. A slight space intervenes, by preference, between the proximate ends of the two mandrels.

To produce a pencil body of the kind hereslip over each of the two mandrels 18 and 19 a circular sleeve 21, and also over the mandrel portion 20 another circular.y sleeve 22 of. lesser diameter.

Pi'eheated strips 23 of fusible material are then laid adjacent to the opposite sides of the larger sleeves andpther shorter strips 24 upon opposite sides of the smaller sleeve 22, 'so as to receive pressure from the dies when the same are moved toward each other in response topressure from the platens. Heat in a suflicientdegree is then applied to 'reduce the fusible material to a plastic state, the heaters being preferably carried by the platens, as indicated at 30.

-W'hen the dies come together they will move .from thev position of Fig. 4 to that which is shown) in Fig. 5. Any excess of material `in the dies may escape through small openings into crevices 25 formed at the ends'of the moulds. It is to be noted that thel circular sleeve 22 surrounding the .elliptical mandrel portion is compressed by the action of the dies so as to assume a cor- 'responding elliptical shape. This change in cross section is clearly illustrated by reference to Figs. 6' and 7.

The moulding operation just described contemplates the use of fusible material which may conveniently be in the forin of strips. These may be pre-formed yto the exact size and shape whichit isdesired to use, thereby assuring a correct amount of 'material for each moulding operation. It is possible, however, to handle the fusible material in the form of a cylinder 26 which is extended over4 the mandrels, as shown in Fig. 9. This requires the handling of but one piece of material instead of four, as previously explained. The behavior of vthis material, when subjected to heat and pressure, is the same as already noted.

lThe product resulting from the moulding pocess just described appears in Fig. 8.

1ere is shown a body. having at each Aend a cylindrical chamber with metallic lining thereiln'one of these chambers at the end being in communication with the adjacent elliptical chamber, which also is equipped with a liningsof'similar contour. Between this vinner chamber and the one adjacent is a thin wall 27 produced by fiow of the fusif ble material through the space .intervening i between the adjacent ends of the two larger mandrels. Such a pencil body has many desirable characteristics, particularly when associated with an operating member lat the ltip of the kind set forth in my copending application alreadyk referred to. 'Y

The present invention may advantageously be used 1n the manufacture of objects -other than pencil bodies. For example, I

have'suggested in Fig.`12 a cylindrical fountain pen barrel 28 which may be formed with the aid of companion dies B and C.

`similanin all respects to the onesalready described. Projecting from one of the end blocks 17 is a single mandrel 29 which..y produces in the completed product achamber adapted for the reception of ink.

l claim:

1. The method of forming a. encil body 1n which is a lined axial cham er at each end, which consists in extending a 'pair of aligned mandrels between a pair of die .chambers of the body, scribed.

molds, in fitting upon each mandrel a sleeve, in placing between the vmolds on opposite sides of the sleeves strips of fusible material, and in then applying pressure and heat to the dies whereby to fuse in one operation the strips of material into an integral body in which the sleeves form linings for the end chambers thereof, substantially' as described. 2. The method of forming a pencil body in which is an axial chamber having a metallic lining of elliptical contour, which consists in' extending an elliptical mandrel between a pair of die moulds, in fitting over the mandrel a circular sleeve, in placing be-y tween the molds a quantity of fusible material, and in then applying ressure and heat to the dies whereby to flilse the material intoan integral body in which the sleeve is deformed into an elliptical lining for the chamber within the body, substantially as described.

- 3. The method of'forming a pencil bod in which is a lined axial chamber at each end, which consists in extending a pair of aligned mandrels between a pair of die 90 moulds the adjacent ends of which are slightly separated, in fitting over yeach m'andrel a sleeve, in placing between the moulds 4a quantity of fusible material, and in then applying 'pressure and` heat to the dies 95 whereby to fuse the material in one .operation into an integral body having a cross wall through the space between the mandrels, the sleeves forming linings in the end substantially as de- 4. The method of forminga pencil bod having at one end an axial chamber which1 is circular in its outer portion and elliptical throughout its inner portion, which consists in extending between a pair of die moulds a'mandrel having' a circular cross section throughout one portion of its length and an elliptical cross section throughout the'remainin'g portion of its length, in ap- 1l plying circular sleeves to the two portions of Athe mandrel," in placing between the moulds a quantity of fusible material, and .1n then applying pressure and heat to the dies whereby to fuse the material into an integral body in which the sleeves form 'linings for` the axial chamber therein, the Yinner sleeve being. .deformed to an elliptical 5 whereby to fuse the material in one operation into an integral. body in which the sleeves form. linings for the end chambers thereof, and finall in withdrawing' the 'moulds from the body and the mandrels 10 from "the sleeves, substantially as described.

6.A The method of forming a-,hollow pencil body, which consists in placing between a 'pair of die mouldsphaving a mandrel ex` tended` centrally y between them a. quantity 15 of fusblematerial in solid form which 1s dis sed on opposite sides of the mandrel,

anv in then applying pressure and heat to the dies wherebyto fuse the material inv one operation into an integral body, substantially as described. Y

7. The method of forming a pencil body having a chamber proceeding inwardly from an end thereof, which consists in extending between a pair of die moulds a mandrel conforming in size and ,form to said chamber, in placing between the moulds and onv opposite sides of the mandrel a stri of solid fusible material, and in then app ying pressure and heat to the dies whereby to fuse the material in one o ation' into an integral body from which e mandrel is removable, substantially y as described,

JOHN 1 LYNN. v

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